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Authorities in Massachusetts and New Hampshire are cracking down on “synthetic marijuana,” a drug that has been linked to a series of recent overdoses as it remained on store shelves despite federal attempts to ban it.

New Hampshire Governor Maggie Hassan this week declared a public health emergency linked to a brand of the drug that she says has sickened dozens of people this month around Manchester and Concord. The move gives police tools to seize packets of one type of the drug, called “Bubblegum Flavor” of “Smacked!”

In Massachusetts, the Legislature recently passed a state ban on such synthetic cannabinoids, which are also known as “spice.” Though the products are often identified as incense and potpourri, authorities say they are widely smoked or brewed into tea.

New Hampshire is one of the few remaining states without an explicit ban on synthetic cannabinoids, though the state’s officials say they are studying how to craft an outright ban. That’s a difficult proposition, because the drugs’ chemical compounds change regularly as producers seek to evade regulation.

Dr. Jose Montero, state public health director for New Hampshire, said that though the drugs are regularly compared to marijuana, they can be much more dangerous — and their effects difficult to predict.

“They keep changing it all the time, playing this game with the federal government to see what’s illegal and what isn’t,” he said. “These are just psychotropic drugs.”

Multiple attempts to reach suppliers of the substance were unsuccessful Friday.

The US Drug Enforcement Administration classified many of the active ingredients in synthetic cannabinoids as controlled substances in 2011, and this year has been expanding its efforts to rein in spice and other synthetic drugs — including bath salts and Molly.

But in areas without state or local laws prohibiting the drugs, police can’t enforce the DEA ban without the help of federal agents.

Authorities say they have been further challenged by the rapid changes in the formulas of the substances — alterations they believe producers make in an attempt to circumvent laws and regulations against the distribution of specific chemical compounds.

In a statement announcing the New Hampshire emergency declaration, Hassan said the state has found controlled substances in other brands of spice. But she said she took the step of calling out “Smacked!” after at least 41 people experienced “serious medical reactions” to it since Monday — including 20 taken by ambulance to hospitals.

The state has no reports of deaths from the drugs, but Montero said there have been a variety of symptoms: passing out, hallucinations, and cardiovascular distress are some examples.

“These products pose a serious threat to public health, especially to young people, and it is our responsibility to do whatever we can to combat the recent rash of overdoses,” Hassan said in a statement.

Dr. Christopher Rosenbaum, director of toxicology at Newton-Wellesley Hospital, said people who have smoked spice products have also suffered from agitation, nausea, and vomiting. There have been some reports of seizures.

He applauded Hassan for taking strong action against the products.

“People are smoking substances without knowing what’s in them,” said Rosenbaum, who has studied synthetic pot. “I would argue these products are more dangerous than the [marijuana] they are intended to replace.”

Massachusetts health officials said Friday that while they are aware of anecdotal reports of overdoses from synthetic drugs, there have not been any large-scale problems like those seen in New Hampshire.

McKenzie Ridings, a spokesman for the Boston Public Health Commission, said, “There haven’t been any real problems” in the city.

But Anne Roach, a spokeswoman for the state Department of Public Health, said a substance abuse bill recently signed by Governor Deval Patrick gives the agency emergency powers to temporarily ban dangerous products when circumstances warrant.

“This action gives law enforcement the tools it needs to crack down on these emerging drugs,” Roach said.

Another new Massachusetts law banning synthetic marijuana has a provision intended to prevent chemical alterations from circumventing the rules, according to Senator Michael O. Moore, a Millbury Democrat who pushed for the change.

Moore said he became interested in the issue after a constituent told him that young people were becoming ill after using the drug. An effort to ban synthetic marijuana fizzled in 2012 amid a successful campaign to crack down on drugs known as bath salts, but passed as part of a budget deal in this year’s recently concluded legislative session.

Law enforcement officials in Moore’s district are reaching out to store owners in the area to let them know about the ban on spice.

“If they’ve purchased it and it’s an outlawed substance, I guess that’s going to be a loss that they’re going to have to declare on their taxes at the end of the year,” he said. “Teens and kids ... are overdosing. We have to look at the public safety.”